Relative yield of charged and neutral heavy meson pairs in e^+ e^- annihilation near threshold

Abstract

The subject of the charged-to-neutral yield ratio for B{\bar B} and D{\bar D}pairs near their respective thresholds in e^+e^- annihilation is revisited. As previously argued for the B mesons, this ratio should exhibit a substantial variation across the Upsilon(4S) resonance due to interference of the resonance scattering phase with the Coulomb interaction between the charged mesons. A simple alternative derivation of the expression describing this effect is presented here, and the analysis is extended to include the D meson production in the region of the psi(3770) resonance. The available data on Kaon production at the phi(1020) resonance are also discussed in connection with the expected variation of the charged-to-neutral yield ratio.

arXiv comment14 pages, 2 figures

References in corpus (7)

• Measurements of the parameters of the $\varphi (1020)$ resonance through studies of the processes $e^{+}{e}^{-}\to K^{+}{K}^{-}$, $K_S{K}_L$ and ${\pi }^{+}{\pi }^{-}{\pi }^0$
• Measurement of branching fractions for exclusive B decays to charmonium final states
• Measurement of the Relative Branching Fraction of ${\rm Y}(4S)$ to Charged and Neutral B-Meson Pairs
• Studies of B0-B0bar Mixing Properties with Inclusive Dilepton Events
• Variation of the relative yield of charged and neutral B mesons across the Upsilon(4S) resonance
• Isospin violation in e+ e- --> B Bbar
• Measurement of the Ratio of Branching Fractions of the Upsilon(4S) to Charged and Neutral B Mesons

Cited by in corpus (8)

• Quarkonia and their transitions
• The $\bar{c}c$ purity of $\psi (3770)$ and ${\psi }^{\prime }$ challenged
• Possible new resonance at the $D^{\ast }{\bar{D}}^{\ast }$ threshold in $e^{+}{e}^{-}$ annihilation
• Isospin breaking in the yield of heavy meson pairs in e+e- annihilation near threshold
• Charm Physics with BES-III at BEPC-II
• Coulomb effects in the decays ${\rm Y}(4S)\to B\bar{B}$
• Invariant-mass spectrum of $\Lambda \bar{\Lambda }$ pair in the process $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$
• Effects of isospin violation in the $e^{+}{e}^{-}\to B^{(\ast )}{\bar{B}}^{(\ast )}$ cross sections